I do like the card slots in the cases, and that the manuals are more accessible. But I had alot of memory cards that did not fit.
Having one memory card for each game seems a bit extreme. Considering most game only use one block. Now in the case of Tecmo's Deception I understand. I remember renting it back in the day and having to go out and buy a new memory card, because mine didn't have enough space.
However as far as collecting goes, I like to keep the factory default cases, and art.